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Jug 2, 1925. l 1,540,253

H. DOURIF A STONE GRINDING MILL Filed April l,l 1924 I 2 Sheets-Sheet 2 aan;

Patented .lune 2, 1925.

' narran stares STNE-GRINDING MILL.

Application filed April 1,

./'o @ZZ 107mm 2f 'may concern: Y

lle it known that I, Hanru Dormir, a

chemical engineer', citizen of the Republic of France, residing at Huntington, in the countyof Cabell and State of West Vin' ginie, have invented certain nevv anduseful Improvements in Stone-Grinding Mills, of which the following is aspecification.

rlhis invention relates to improvements in stone grinding mills, and particularly to improvements in overdriven and underdrivenivet grinding stone mills. n

ln the type of mill above mentioned, the grinding takes place between Y a pair .of stones under the crushing effect of the weight of the top stone, which revolves on the flat top of the stationary stone *thereunder, while at the same time providing a connection with this stone for guiding and driving it, which will permit the free movement of the stone, toward the stationary stone, for .effecting the grinding of the particlestherebetween `With this class of mills, it is usual to mount a bearing structure and other supporting and guiding elements over the top' of the moving stone,

` which occasions considerable dela-y, in the event that removal of either stone is necessary for thepurpose of refacingfthe grinding surfaces, as it 1s necessary to remove all of this structure together with the driving connections to the stones before the removal of either stone can be effected. It will be at once appreciated that this consumes considerable time and labor,ivhichdelays the output of theproducts produced in the mill, in addition to adding considerable expense in removing and replacing this structure.

The type of mill, above referred to, is one which is used particularly forcolloidal grinding purposes. Colloidal grinding mills of `this characterJ which are usually called batch mills are used for grinding disintegrated ultramarine, in the manufacture of ultramarine'blue pigments. ln the manufacture of these pigments it is Well lnovvn in the arty that Vthe quality of the pigments produced is the result of the fineness of the product produced in the colloidal grinding mill, and the liner the products, the higher the quality of pigments. The most generally used present method of colloidal grinding for ultramarine employs a'batch mill having a bearing in the bottom of the tank receiving Vthe lower end of the drive shaft for the movable stone which extends above 192i. sei-iai no. zc-3,195;

the tank and is driven by suitable apparatus above the tank, and for this reason is called an o verdriven mill. In view of the fact that the grinding stones of these mills Weiglrin the neighborhood of nine hundred pounds, and as frequent redressing of the active faces of the grindingstones isnecessary, it will be seen thatconsiderable difficulty is experienced and timelost inthe production of pigments in the removal of the driving apparatus for permitting the removal of the Y stones as above set forth. In' all colloidal grinding mills of this character, themovable stone has free contact with the grinding face of the stationary stone, and in no case is there any-means vfor holding the Vstones in spaced relation or providing any space therebetween, but on the other hand, the Weight of the stone is depended upon to maintain intimate Contact between the faces of the movable and stationary stones, in order to effect a colloidal grinding of the disintegrated ultramarine Which is supplied to the tank` with substantial batches of Water, so that a batch of ultramarine to be ground will substantially fill the tank.

` Another disadvantageous feature of the type of mills now' in use is in the manner of connecting the driving means with the movable stone, which at present results in considerable vibration being transmitted to the driving means and the mounting structure therefor, due to the vibration of the grinding stone, in the grinding operation, and

which is a very undesirable feature asy it reduces the life of the driving structure.

This invention is designed in view of the above noted considerations, to materially improve the constructions of colloidal batch grindingmills and to provide What Vmay be termed an under-driven colloidal batch mill. This invention is designedy to materially improve the construction of the type' of mill above mentioned, and overcome the disadvantages of vpresent structures, some of Which are pointed out above, by providing a bearing structure, and mounting therefor, arranged in such a mannerr that the driving means jor connection with the stone are readily removable from the drive shaft lill) which will innnediately permit` the removal but `at the same time permitting the ready removal of the bearing from the column byV plied to the bearing.

The driving unit for the movable stone is indicated generally at 2'?, and comprises across head 2S, formed in the central portion with an opening 29, for receiving the shaft 4, the cross khead being slidable on the shaft, and held against rotation thereon by a key 30, and adapted to be secured in any set position in rigid connection with the shaft 4 by a suitable set kscrew' 31. Limiting screws 32 mounted in the shaft 4 above the bearing 24 and the upper end .of the tubular housing 18 limit the downward sliding movement of the cross head, in its application to the shaft. The outer ends of the cross head are provided with bores 33 which receive driving' rods 34, which rods'are slidable in the bores 38, and are adapted to be secured in adjusted position by suitable set screws 35. The upper endsl of the driving rods 34, are provided with aplurality of spaced transverse openings 36, for `receiving said pins 3'1", which are adapted to be positioned in any one of the openings 36 in the drive rods for determining the adjustment thereof in relation to the cross head 28.`

Keys 38 prevent the rotation of the drive rod in the cross head, in an obvious manner. The movable or rotatable grinding stone 16 is provided, in the present case, with a pair of diametrically opposite recesses 39, which are of frusto-pyramidal form, and open into vthe central opening 17 of the stone, to permit the insertion and removal of driving blocks 40. The outer sides of the' drive blocks are of frusto-pyramidal form, to provide an accurate fit with the recesses 39 in the stone, the blocks being cemented or otherwise secured in the recesses to prevent movement thereof after insertion into place. The driving blocks are formed with recesses 41, opening through the inner sides thereof, as clearly shown in Figure 5 of the drawings, and which are adapted to loosely receive the lower ends of the drive rods 34, as shown in Figure 2. A clearance is provided between the lower ends of these rods and the bottom of the recess 41, in order to prevent the transmission of vibration from the driving stone in operation, to the drive unit 27 place an undesirable strain and wear on the driving unit and shaft, together with the n'iounting bearings therefor, and thereby lessen the life and efficient operation of the grinding mill. i

rthe bottom portion of the container 1 is portion mounted `in the bearing 24, so that lubricant may be supn 22 of the tubular provided with a liller of suitable material,

around the stationary grinding stone 12 and in the opening 13 thereofabove the flange 1S) of the tubular column, as indicated at 42, for providing an inner bottoni surface for the container of a smooth character, slightly below the upper edge or grinding surface 15 of the stationary grinding stone. The v filler also insures the water-tightness of the several parts assembled at the bottoni of the container. This filler further secures the stationary stone against vibration on the bottom 7.4 y

From the above description, it will be seen that this invention includes a `structure wherein the movable grinding stone may be readily removed from its-assembled relation, in the container i driving unit 27 from the drive shaft 4, which is accomplishedV by loosening the set screw 31, following which the unit may be slidably removed from the shaft, and the movable stone 16 also removed over the enlarged end 17 is substantially larger than the portion 22 of the bearing housing. Provision is also made for a convenient 'adjustment of the drive rod 34,so that the lower end thereof will always seat in the recesses41` below the upper face of the rotatable stone 16, in order to center the driving. impulse below the upper surface ofthe stone, while at the same time providing a loose driving connection independent of any connection with the stone, and thereby eliminating the transmissionof vibration tothe driving unit. It will also be `understood that the bearing 24 is conveniently mounted in the enlarged upper end of the tubular housing y18, may be readily removed therefrom for adj ustment or renewal. The manner of assembling the bottom 7 to the tubular tub 6 and seating the stationary grinding stone 12 on the bottom, having the cooperating portions for preventing rotation of the stone when seated, provides an exceedingly convenient construction which is held in assembled relation, and in water tight connection by the filler 42.

The tubular column 18 can also be economically constructed for mounting the upper bearing which cooperates with the driving unit, in permitting the ready removal of the grinding stone, without removing the upper bearing from the tubular housing or the hous- As heretofore statedVthe above-described Vmill `is used as a` batch mill for colloidal grinding and employs the principles of the under-driven type of mill in the operation of the movable stone, in order that read and convenient access may be had to the removable stone and the interior of the tank housing 18, as the opening Vso that it 24, in the manner described, and

1, by merely removing the lll) -ing from assembled connection with the container 1. and the shaft 4, which would otherwise Y Vder lthat they .may

of vunevenness and wear, and efliciently, without yto the drive shaft,

with merely the removal Lof the cross head and `driving -rods 3a, so that the stone may be removed. for reuressing or for lother purposes. A further advantage of the Aconstruction above described :is in the provision of .an under driven mill of .this-character, of a substantially rigid bearing forv .the shaft, at the uppe end thereof, .and at the point where the power for driving the movable stone is taken off. `rlhe loose'engageL ment of the rods 34 with the drive blocks in the movable stone prevents the vibration of the stone in grinding from being transmitted :to the ldrive shaft, which would cause irreparable damage to th bearings yand wear the iarts in-an exceedingly shorttime.

ln the operation of a colloidal grinding mill of this type, the mor-able stone is .always in contact with the active face gol the stationary .stone through the weight thereof in order `to effectthe colloidal grinding Vof disintegrated material placed therein. During this colloidal grinding .of the-material, it is found, .from actual practice, Ythat the portion ofthe grind-ing stone adjacent the center will wear considerably-less than the portions adjacent the periphery ofthe stone, and `that due `to the fact that faces of these stones are harder .than other parts the grinding faces willv become uneven, as `the parts which Vare sof-.ter wear away. This .wearing of the outer portion in advance of the-central portion requires fre- Aquent removal of the grinding stone, inorlbe redressed to produce efficient colloidal grinding results. As the vstones wearaway, it frequently happens .that they wear `considerably more on one lside 'than another and the .red-.ressing thereof does not `always accurately replacethe stones in their original relation. lt results from this that frequently the stones rotate in .a plane, the axis of whicliisslightly out ofline with 'the shaft, and in the case of a direct driving connection with the stone, the vibrations ther-col during grinding are transmittedto the shaf .vliichrdestroys the bearings. ln Ithe present invention, however, the stone is free to operate freely under all conditions still operate transmitting vibrations and this results through the particular character of free connections between the dri-ve rod .and the -rodsk 34:.

In the operation -of Va number of these -miflls constructed in vaccordance with this invention, it has `been found 'that .the output of each mill has been considerably increased through the convenient manner of ,providing access forremoving the grindingstones for .redressing, so that `the mills may .be-kept in more continuous operation than has heretollore been possible in the art, with the ob- -tainance of thev usual degree of efficiency vre- `zquired. In :the provision of a batch for parts of the grindingin `the container vG., .the same is :filled substantial-ly to .the vftop :of the bearing coliunn 18.*.and .itwill belseenthat no parts of, the ,shafits .oirbearings areisubject .to the de? structive .action ofthe vultramarine :or other content .oit the batch beingground, and .at

`the lsame time sufficient operation of the tween .the ends of the sections 24 and the bot-- tom .of the .guides in the bear-ing column for iXin-g .the bea1'"':ing in set position after .the same has been inserted into the column, and which 4may be thereafter readily removed i when desired..

A1 circulation of :the batch within the tanl is obtained in devices .ofthiis character by providing small `grooves extending diagonally with respect tothe diameter of the stone in one of the active faces of one of the stones, preferably the movable stone, so that in the rotation `ol said stone'will have tendency .to force the liquid and material thereunder voutwardly and draw new materialinwardly through the center, so as to provide for a'continuous vcirculation of thc batch between the grinding faces of removable and stationary stones.

lllliat .is .claimed is:

1. In combination in a colloidal bal-cli grinding mill, a container Vhaving a bottom formed with .an opening in the central por-l tion, a tubular column mounted in the 'bot- .tom around the opening, an annular stationary grinding stone removably seated on =the bottom 'of the container in concentric relation to the column, cooperating means on the grinding stone and the bottom 'of .the container for preventing rotation there.

,ov-f on "the bottoni, an annular rotatal'ile .grinding stone mounted around the column on fthe Astationary stone for grinding cooperation therewith, and driving meanecx- .tending .thru the tubular column for drir- .ing the .rotatable :grinding stone.

2. ln an under-driven batch mill, a conn tainer having .a bottom formed with au opening .in the .central portion, a tubular column mounted in the bottoni around the opening, the bottom being pro-vided with upwardly projected radial ribs, a stationary grindingstone adapted to seat on the. Vbottom'and 'having radially extendingy recesses for receiving Ythe ribs, a movable .grinding stone mounted on the `stationary stone around the. column for grinding c ooperation there-with and driving rmeans extending Athrough the tubular column .for the iov-.able stone.r Y.fl'n a colloidal vbatch grinding mill, a container,.a removable bottom on said container, al stationary grinding stone seated on the ybottom of said container, a. filler for the container adapted to forni the in lll() terior bottoni surface thereof, betiveiii the grinding stone and the container Walls and retaining said stone in set position, a movable grinding' stone for grindingcooperastationary grinding stone formed With` aV central opening adapted to lit over the bearing column and the neclr and seat on the bottoni of said container, means for holding said stationary stone against rotation in seated position, a filler for the bottom portion of the container adapted to seal the mountings of the stationary stone and the bearing columnand form an interior bottom surface in the container, a rotatable grinding stone adapted for grinding cooperation ivith thestationary stone, and driving means having bearings in said column for rotating said rotatable stone.

v5. In combination in a colloidal batch grinding mill, a container having a removable bottom formed with a'central open-- ing, a bearing column mounted in the container over the central opening, an annular stationary grinding stone having a central opening adapted to receive the bearing column, said stone being seated on the bottom and held against rotation thereon, means carried by. the bottom foil centering the bearing column and the Vstationary grindiiig stone in concentric relation, and sea-ling means for the bottom of the container adapted to'forin the inside bottom portion thereof.

G. In combination in a colloidal batch `grinding mill, a container having a bottoni formed with a central opening, a bearing column mounted in said container over the said central opening, a stationaryT grinding stone having a central opening positioiied over said bearing column and seated against rotation on the bottoni of said container, means carried by the bottom for centering said bearing coliiiiiii and grinding stone, a rotatable grinding stone having a central opening adapted to receive the bearing column for positioning in grinding cooperation with said stationair)7 stone, and removable driving means having bearings in said column for driving said rotatable stone. i

'7. In combination in a colloidal grinding mill, a container formed with an opening in the central portion of the bottoni thereof, a bearing column removably mounted on the bottom of said container and ei;- tending upwardly therefrom, in concentric relaiion with said opening. a lbearing removablymouiited insa-id column, a stationary grinding member mounted inthe bottom of" said container around the column, a movable grinding member cooperating there ivith,'and mounted around the column and a driving means extending through the bearing in the column for driving said movable grinding member.

8. A grinding mill of the class described including a container having the bottom formed ivitli a central opening, a tubular bearing column removably mounted in the bottom of said container around said opening, a bearingv slidablyV and removably mounted in the upper end of said bearing column, va drive shaft extending through theopeningiii-:the bottom of said container and said bearing column and received by said bearing, a stationary grinding member mounted in said container, a movable grinding member mounted in said container for cooperation With the stationary membeig and driving means betiveen said sha-ft :and movable driving member, for driving the movable member to effect a grinding `cooperation thereof, said driving means being positioned above the movable member.

9. An underdriven colloidal batch grinding Vmill comprising a container formed With a centralopening in the bottomftliere-` of, a column mounted in the bottom of said container and around the opening, al drivev shaft extending through said container bottom and said column, a stationary grindingv member mounted in said container, a

rotatable grinding member mounted in said v column mounted in said container around the central opening, a .drive shaft extending thro-ugh said Column and having bearing therein, a stationary grinding member mounted in said container, a rotatable grinding member mounted in said container for grinding cooperation with said stationary member, said grinding members being mounted around said column, and a driving unit removably mounted on said shaft and having an adjustable driving connection With said rotatable grinding. member :for

Veffecting.the operation thereof in the rotation of thedrive shaft.

11.111 an underdriven `batch grinding mill, a container formedvvitha central opening in the bottom thereof, a bearing column mounted in thecontaine'r around `.the

central opening in the'bottom, a drive shaft` extending through Vsaid opening and bearingV column and having bearing therein, a stationary grinding member, a rotatable grinding member forcooperation with the stationary member, and a driving unit removably mounted on said shaft above said column having a f'ree driving engagement wit-h said rotatable driving member. V V

12. In an underdriven batch grinding mill, `a container formed with a central opening in the bottom thereof, a bearing column mounted in the container around the central opening in the bottom, a drive shaft extending through said` opening and bearing column and having bearing therein, a stationary grinding member, a rotatable grinding ineinbeifor cooperationwith the stationary member, and a driving unitv including aV cross head removably mounted on. said driving shaft, and drive rods ad"- justably mountedl in said head and having a free driving engagement with said rotatable grinding member, for effecting the rotation thereo in the operation of the shaft.

13. In a colloidalbatch grinding-mill?, a container, a drive shaft rotatably mounted in said container, a stationary grinding member moruited in the container', a rotatable grinding member mounted in said container for grinding cooperation with 'said stationary member, said' rotatable Vgrinding member being formed witha plurality of recesses, driving blocks mounted in said recesses, and driving means removably mounted on sa-iddrive shaft above said grinding meinbers, and having a loose engagement with Vsaid drive' blocks for edectingy an operationV o f the rotatable grinding member in the rot-ation of theY shaft,.and centeringthe driving impulse below the surface of said rotatable driving member. 7

14. Inv combination in a batch grinding mill, a container, al shaft rotatably mounted in said container, a stationary grinding member mounted in said container, a rotatable grinding member mounted in said container for grinding cooperation with said container for grndingcooperation with Vsaid stationary member, said rotatable grinding member being formed with a plurality of frusto-pyramidal1shaped recesses, drive blocks o l" f'rusto-pyramidal forni `mounted in' the recesses: in said' rotatable grinding member, and driving means carried by said drive shaft beyond the grinding members',y having a loose driving engagement in said drivexbloclrs.

V15. In comb'nation inf an underdriven batch` mill, a' container,having a central opening in the bottoni`- thereof, a bearing column mounted in' said container and surrounding the central' opening in the bottom th reef; aidri've shaft 'rotatably mount- Y ed an'dAQliaving bearings' in said column, an

annular' stationary. grinding member having a central opening adapted to receive said column and mounted in concentric relation thereto, in the bottom of' said con- .I

tainer, a rotatable grinding member having a central opening adapted to receive said column positioned on the stationary grinding member for grinding cooperation therewith', and a removable drive unit mounted on said drive shaft beyond the rotatable grinding member and havingl a loose driving engagement with said rota-table grinding member, thecenter of the driving impulse with the rotatable grinding` member being below the surface of said grinding member, whereby the grinding member may be removed from said container, following the removal ofthe driving unit from said shaft.

16. An underdriven batch grinding mill of the class described, wherein a container is provided with a central opening inY the bottom thereof receiving the drive shaft for the mill, a bearing column comprising an elongated tubular member mounted on the bottom of said container, in ,registry with the central opening, the `upper end of said member being formed with a bearing housing and extending upwardly in said container tothe ltop portion thereof, vsaid bearing housing/removably receiving a bearing for the drive shaft.

1?.-A batch grinding mill comprising a container having a central opening in the bottom, a tubular column mountedlon the bottom of the container over the opening and terminating adjacent the top portion rof said container, a ringvshaped stationary grinding stone mounted on the bottom oi the container in concentric relation with the column, a rotatable ring shaped grinding stone mounted in the container on the c stationary grinding stone,v said column terminating substantially above the top of the rotatable stone, a drive: shaft rextending through and terminatiiig'abovc the column, and a driving unit removably mounted on the shaft above the'column having a free driving` connection with the rotatable stone. n 18. An underdriven batch grinding mill comprising a container having a bottom plate adapted 'for mounting on a supporting structure, a tub removably mounted on the bottom plate, a tubular bearing column mountedv in the central portion of the bottom plate, and having the centra-l portion thereof registering with 'an opening in the bottom plate, a stationary grinding stone mounted on the bottom plate around the Column, a rotatable grinding stone mounted around the column on the stationary grinding stone, saidbearing column extending above the grinding stone, and driving means having a bearing in the upper end of thefbearing columnand extending above l lthe'grinding stone'and having a free drivcou'iprising a bottom plate having a central opening, a tub mounted on said plate, forming a batch container therewith, a bearing column rigidly mounted on the bottom plate, a stationary grinding stone positioned on the bottom plate, and sealed means for securing said elements in set'relation providing a liquid tight Container.

20. An underdriven batch grinding mill, wherein a batch` container is provided with a central opening in the bottom, and a tubular bearing column extending upwardly from said bottom in registry with said opening, and wherein the container removably receives stationary and removable grinding stones positioned around said column, and wherein the column forms a means for protecting a drive shaft extending therethrough, and having bearings in the upper end; a drive unit for the movable grinding stone removably mounted on said shaft bevond said column, having adjustable drive means extending into the container for free driving engagement with said movable stone.

2l. rin underdriven batch grinding mill, wherein a batch container is provided with a central opening in the bottom, and a tubular bearing column extending upwardly from said bottom in registry with said opening, and wherein the container removably receives stationary and removable grinding stones positioned around said column, and wherein the` column forms a means for protecting a drive shaft extending therethrough and having bearings in the upper end; a drive unit for the movable grinding stone removably mounted on the shaft beyond said column having driving extensions adjustably carried thereby projecting into engagement with said movable grinding' stone, the extensions and the grinding stone having free engagement peri mitting limited relative movement in all directions of said grinding stone.

22. An underdriven batch grinding mill, wherein a batch container is formed with a central opening in the bottom, a bearing -column 'formed of a tubular member flanged at the lower end to seat on said container bottom, means securing said column in rigid position on said bottom in registry with the yopening therein, and a bearing housing formed in the upper end of said member for receiving a bearing for a drive shafty extend-ing therethrough.

In testimony whereof I affix my signature.

Hanni Dormir.

June 2. 1925. 1,540,29

F. R. DRAVQ DRIVING GEAR FOR Bons xliled March 21. 1925 s'sheets-sheet 1 l l lI IINENTOR 

